Ok, I know the Nightwish version very well. Did you know the Nightwish version is actually a cover? Overall this is a really kickass cover! It's well performed, well mixed, and the extra embellishments are great. Critiques: I think the storm fx at the beginning should be lowered out faster. Rhythm guitars have a slight lack of balls and a slight lack in clarity. The vocal harmonies are missing. The vox are not quite aggressive or epic enough either - maybe some distortion and delay/verb would help.